Circle Circumference Calculator
Circle Circumference Formulas
Key formulas:
- Circumference = 2π × radius
- Circumference = π × diameter
- Circumference = 2 × √(π × area)
- Arc Length = (angle/360°) × circumference
- Arc Length = radius × angle (in radians)
Note: For precise calculations, this calculator uses the mathematical constant π (pi) rather than the approximation 3.14. Enter an angle less than 360° to calculate arc length and percentage.